Disconnect hostapd from building in base
[dragonfly.git] / contrib / hostapd / src / utils / common.c
CommitLineData
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1/*
2 * wpa_supplicant/hostapd / common helper functions, etc.
a875087d 3 * Copyright (c) 2002-2007, Jouni Malinen <j@w1.fi>
ebfa2275 4 *
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5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
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7 */
8
9#include "includes.h"
10
11#include "common.h"
12
13
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14static int hex2num(char c)
15{
16 if (c >= '0' && c <= '9')
17 return c - '0';
18 if (c >= 'a' && c <= 'f')
19 return c - 'a' + 10;
20 if (c >= 'A' && c <= 'F')
21 return c - 'A' + 10;
22 return -1;
23}
24
25
4781064b 26int hex2byte(const char *hex)
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27{
28 int a, b;
29 a = hex2num(*hex++);
30 if (a < 0)
31 return -1;
32 b = hex2num(*hex++);
33 if (b < 0)
34 return -1;
35 return (a << 4) | b;
36}
37
38
39/**
4781064b 40 * hwaddr_aton - Convert ASCII string to MAC address (colon-delimited format)
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41 * @txt: MAC address as a string (e.g., "00:11:22:33:44:55")
42 * @addr: Buffer for the MAC address (ETH_ALEN = 6 bytes)
43 * Returns: 0 on success, -1 on failure (e.g., string not a MAC address)
44 */
45int hwaddr_aton(const char *txt, u8 *addr)
46{
47 int i;
48
49 for (i = 0; i < 6; i++) {
50 int a, b;
51
52 a = hex2num(*txt++);
53 if (a < 0)
54 return -1;
55 b = hex2num(*txt++);
56 if (b < 0)
57 return -1;
58 *addr++ = (a << 4) | b;
59 if (i < 5 && *txt++ != ':')
60 return -1;
61 }
62
63 return 0;
64}
65
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66/**
67 * hwaddr_compact_aton - Convert ASCII string to MAC address (no colon delimitors format)
68 * @txt: MAC address as a string (e.g., "001122334455")
69 * @addr: Buffer for the MAC address (ETH_ALEN = 6 bytes)
70 * Returns: 0 on success, -1 on failure (e.g., string not a MAC address)
71 */
72int hwaddr_compact_aton(const char *txt, u8 *addr)
73{
74 int i;
75
76 for (i = 0; i < 6; i++) {
77 int a, b;
78
79 a = hex2num(*txt++);
80 if (a < 0)
81 return -1;
82 b = hex2num(*txt++);
83 if (b < 0)
84 return -1;
85 *addr++ = (a << 4) | b;
86 }
87
88 return 0;
89}
90
91/**
92 * hwaddr_aton2 - Convert ASCII string to MAC address (in any known format)
93 * @txt: MAC address as a string (e.g., 00:11:22:33:44:55 or 0011.2233.4455)
94 * @addr: Buffer for the MAC address (ETH_ALEN = 6 bytes)
95 * Returns: Characters used (> 0) on success, -1 on failure
96 */
97int hwaddr_aton2(const char *txt, u8 *addr)
98{
99 int i;
100 const char *pos = txt;
101
102 for (i = 0; i < 6; i++) {
103 int a, b;
104
105 while (*pos == ':' || *pos == '.' || *pos == '-')
106 pos++;
107
108 a = hex2num(*pos++);
109 if (a < 0)
110 return -1;
111 b = hex2num(*pos++);
112 if (b < 0)
113 return -1;
114 *addr++ = (a << 4) | b;
115 }
116
117 return pos - txt;
118}
119
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120
121/**
122 * hexstr2bin - Convert ASCII hex string into binary data
123 * @hex: ASCII hex string (e.g., "01ab")
124 * @buf: Buffer for the binary data
125 * @len: Length of the text to convert in bytes (of buf); hex will be double
126 * this size
127 * Returns: 0 on success, -1 on failure (invalid hex string)
128 */
129int hexstr2bin(const char *hex, u8 *buf, size_t len)
130{
131 size_t i;
132 int a;
133 const char *ipos = hex;
134 u8 *opos = buf;
135
136 for (i = 0; i < len; i++) {
137 a = hex2byte(ipos);
138 if (a < 0)
139 return -1;
140 *opos++ = a;
141 ipos += 2;
142 }
143 return 0;
144}
145
146
147/**
148 * inc_byte_array - Increment arbitrary length byte array by one
149 * @counter: Pointer to byte array
150 * @len: Length of the counter in bytes
151 *
152 * This function increments the last byte of the counter by one and continues
153 * rolling over to more significant bytes if the byte was incremented from
154 * 0xff to 0x00.
155 */
156void inc_byte_array(u8 *counter, size_t len)
157{
158 int pos = len - 1;
159 while (pos >= 0) {
160 counter[pos]++;
161 if (counter[pos] != 0)
162 break;
163 pos--;
164 }
165}
166
167
168void wpa_get_ntp_timestamp(u8 *buf)
169{
170 struct os_time now;
171 u32 sec, usec;
a875087d 172 be32 tmp;
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173
174 /* 64-bit NTP timestamp (time from 1900-01-01 00:00:00) */
175 os_get_time(&now);
a875087d 176 sec = now.sec + 2208988800U; /* Epoch to 1900 */
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177 /* Estimate 2^32/10^6 = 4295 - 1/32 - 1/512 */
178 usec = now.usec;
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179 usec = 4295 * usec - (usec >> 5) - (usec >> 9);
180 tmp = host_to_be32(sec);
181 os_memcpy(buf, (u8 *) &tmp, 4);
182 tmp = host_to_be32(usec);
183 os_memcpy(buf + 4, (u8 *) &tmp, 4);
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184}
185
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186
187static inline int _wpa_snprintf_hex(char *buf, size_t buf_size, const u8 *data,
188 size_t len, int uppercase)
189{
190 size_t i;
191 char *pos = buf, *end = buf + buf_size;
192 int ret;
193 if (buf_size == 0)
194 return 0;
195 for (i = 0; i < len; i++) {
196 ret = os_snprintf(pos, end - pos, uppercase ? "%02X" : "%02x",
197 data[i]);
198 if (ret < 0 || ret >= end - pos) {
199 end[-1] = '\0';
200 return pos - buf;
201 }
202 pos += ret;
203 }
204 end[-1] = '\0';
205 return pos - buf;
206}
207
208/**
209 * wpa_snprintf_hex - Print data as a hex string into a buffer
210 * @buf: Memory area to use as the output buffer
211 * @buf_size: Maximum buffer size in bytes (should be at least 2 * len + 1)
212 * @data: Data to be printed
213 * @len: Length of data in bytes
214 * Returns: Number of bytes written
215 */
216int wpa_snprintf_hex(char *buf, size_t buf_size, const u8 *data, size_t len)
217{
218 return _wpa_snprintf_hex(buf, buf_size, data, len, 0);
219}
220
221
222/**
223 * wpa_snprintf_hex_uppercase - Print data as a upper case hex string into buf
224 * @buf: Memory area to use as the output buffer
225 * @buf_size: Maximum buffer size in bytes (should be at least 2 * len + 1)
226 * @data: Data to be printed
227 * @len: Length of data in bytes
228 * Returns: Number of bytes written
229 */
230int wpa_snprintf_hex_uppercase(char *buf, size_t buf_size, const u8 *data,
231 size_t len)
232{
233 return _wpa_snprintf_hex(buf, buf_size, data, len, 1);
234}
235
236
237#ifdef CONFIG_ANSI_C_EXTRA
238
239#ifdef _WIN32_WCE
240void perror(const char *s)
241{
242 wpa_printf(MSG_ERROR, "%s: GetLastError: %d",
243 s, (int) GetLastError());
244}
245#endif /* _WIN32_WCE */
246
247
248int optind = 1;
249int optopt;
250char *optarg;
251
252int getopt(int argc, char *const argv[], const char *optstring)
253{
254 static int optchr = 1;
255 char *cp;
256
257 if (optchr == 1) {
258 if (optind >= argc) {
259 /* all arguments processed */
260 return EOF;
261 }
262
263 if (argv[optind][0] != '-' || argv[optind][1] == '\0') {
264 /* no option characters */
265 return EOF;
266 }
267 }
268
269 if (os_strcmp(argv[optind], "--") == 0) {
270 /* no more options */
271 optind++;
272 return EOF;
273 }
274
275 optopt = argv[optind][optchr];
276 cp = os_strchr(optstring, optopt);
277 if (cp == NULL || optopt == ':') {
278 if (argv[optind][++optchr] == '\0') {
279 optchr = 1;
280 optind++;
281 }
282 return '?';
283 }
284
285 if (cp[1] == ':') {
286 /* Argument required */
287 optchr = 1;
288 if (argv[optind][optchr + 1]) {
289 /* No space between option and argument */
290 optarg = &argv[optind++][optchr + 1];
291 } else if (++optind >= argc) {
292 /* option requires an argument */
293 return '?';
294 } else {
295 /* Argument in the next argv */
296 optarg = argv[optind++];
297 }
298 } else {
299 /* No argument */
300 if (argv[optind][++optchr] == '\0') {
301 optchr = 1;
302 optind++;
303 }
304 optarg = NULL;
305 }
306 return *cp;
307}
308#endif /* CONFIG_ANSI_C_EXTRA */
309
310
311#ifdef CONFIG_NATIVE_WINDOWS
312/**
313 * wpa_unicode2ascii_inplace - Convert unicode string into ASCII
314 * @str: Pointer to string to convert
315 *
316 * This function converts a unicode string to ASCII using the same
317 * buffer for output. If UNICODE is not set, the buffer is not
318 * modified.
319 */
320void wpa_unicode2ascii_inplace(TCHAR *str)
321{
322#ifdef UNICODE
323 char *dst = (char *) str;
324 while (*str)
325 *dst++ = (char) *str++;
326 *dst = '\0';
327#endif /* UNICODE */
328}
329
330
331TCHAR * wpa_strdup_tchar(const char *str)
332{
333#ifdef UNICODE
334 TCHAR *buf;
335 buf = os_malloc((strlen(str) + 1) * sizeof(TCHAR));
336 if (buf == NULL)
337 return NULL;
338 wsprintf(buf, L"%S", str);
339 return buf;
340#else /* UNICODE */
341 return os_strdup(str);
342#endif /* UNICODE */
343}
344#endif /* CONFIG_NATIVE_WINDOWS */
345
346
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347void printf_encode(char *txt, size_t maxlen, const u8 *data, size_t len)
348{
349 char *end = txt + maxlen;
350 size_t i;
351
352 for (i = 0; i < len; i++) {
353 if (txt + 4 > end)
354 break;
355
356 switch (data[i]) {
357 case '\"':
358 *txt++ = '\\';
359 *txt++ = '\"';
360 break;
361 case '\\':
362 *txt++ = '\\';
363 *txt++ = '\\';
364 break;
365 case '\e':
366 *txt++ = '\\';
367 *txt++ = 'e';
368 break;
369 case '\n':
370 *txt++ = '\\';
371 *txt++ = 'n';
372 break;
373 case '\r':
374 *txt++ = '\\';
375 *txt++ = 'r';
376 break;
377 case '\t':
378 *txt++ = '\\';
379 *txt++ = 't';
380 break;
381 default:
382 if (data[i] >= 32 && data[i] <= 127) {
383 *txt++ = data[i];
384 } else {
385 txt += os_snprintf(txt, end - txt, "\\x%02x",
386 data[i]);
387 }
388 break;
389 }
390 }
391
392 *txt = '\0';
393}
394
395
396size_t printf_decode(u8 *buf, size_t maxlen, const char *str)
397{
398 const char *pos = str;
399 size_t len = 0;
400 int val;
401
402 while (*pos) {
403 if (len + 1 >= maxlen)
404 break;
405 switch (*pos) {
406 case '\\':
407 pos++;
408 switch (*pos) {
409 case '\\':
410 buf[len++] = '\\';
411 pos++;
412 break;
413 case '"':
414 buf[len++] = '"';
415 pos++;
416 break;
417 case 'n':
418 buf[len++] = '\n';
419 pos++;
420 break;
421 case 'r':
422 buf[len++] = '\r';
423 pos++;
424 break;
425 case 't':
426 buf[len++] = '\t';
427 pos++;
428 break;
429 case 'e':
430 buf[len++] = '\e';
431 pos++;
432 break;
433 case 'x':
434 pos++;
435 val = hex2byte(pos);
436 if (val < 0) {
437 val = hex2num(*pos);
438 if (val < 0)
439 break;
440 buf[len++] = val;
441 pos++;
442 } else {
443 buf[len++] = val;
444 pos += 2;
445 }
446 break;
447 case '0':
448 case '1':
449 case '2':
450 case '3':
451 case '4':
452 case '5':
453 case '6':
454 case '7':
455 val = *pos++ - '0';
456 if (*pos >= '0' && *pos <= '7')
457 val = val * 8 + (*pos++ - '0');
458 if (*pos >= '0' && *pos <= '7')
459 val = val * 8 + (*pos++ - '0');
460 buf[len++] = val;
461 break;
462 default:
463 break;
464 }
465 break;
466 default:
467 buf[len++] = *pos++;
468 break;
469 }
470 }
471 if (maxlen > len)
472 buf[len] = '\0';
473
474 return len;
475}
476
477
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478/**
479 * wpa_ssid_txt - Convert SSID to a printable string
480 * @ssid: SSID (32-octet string)
481 * @ssid_len: Length of ssid in octets
482 * Returns: Pointer to a printable string
483 *
484 * This function can be used to convert SSIDs into printable form. In most
485 * cases, SSIDs do not use unprintable characters, but IEEE 802.11 standard
486 * does not limit the used character set, so anything could be used in an SSID.
487 *
488 * This function uses a static buffer, so only one call can be used at the
489 * time, i.e., this is not re-entrant and the returned buffer must be used
490 * before calling this again.
491 */
a875087d 492const char * wpa_ssid_txt(const u8 *ssid, size_t ssid_len)
ebfa2275 493{
4781064b 494 static char ssid_txt[32 * 4 + 1];
ebfa2275 495
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496 if (ssid == NULL) {
497 ssid_txt[0] = '\0';
498 return ssid_txt;
ebfa2275 499 }
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500
501 printf_encode(ssid_txt, sizeof(ssid_txt), ssid, ssid_len);
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502 return ssid_txt;
503}
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504
505
506void * __hide_aliasing_typecast(void *foo)
507{
508 return foo;
509}
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510
511
512char * wpa_config_parse_string(const char *value, size_t *len)
513{
514 if (*value == '"') {
515 const char *pos;
516 char *str;
517 value++;
518 pos = os_strrchr(value, '"');
519 if (pos == NULL || pos[1] != '\0')
520 return NULL;
521 *len = pos - value;
522 str = dup_binstr(value, *len);
523 if (str == NULL)
524 return NULL;
525 return str;
526 } else if (*value == 'P' && value[1] == '"') {
527 const char *pos;
528 char *tstr, *str;
529 size_t tlen;
530 value += 2;
531 pos = os_strrchr(value, '"');
532 if (pos == NULL || pos[1] != '\0')
533 return NULL;
534 tlen = pos - value;
535 tstr = dup_binstr(value, tlen);
536 if (tstr == NULL)
537 return NULL;
538
539 str = os_malloc(tlen + 1);
540 if (str == NULL) {
541 os_free(tstr);
542 return NULL;
543 }
544
545 *len = printf_decode((u8 *) str, tlen + 1, tstr);
546 os_free(tstr);
547
548 return str;
549 } else {
550 u8 *str;
551 size_t tlen, hlen = os_strlen(value);
552 if (hlen & 1)
553 return NULL;
554 tlen = hlen / 2;
555 str = os_malloc(tlen + 1);
556 if (str == NULL)
557 return NULL;
558 if (hexstr2bin(value, str, tlen)) {
559 os_free(str);
560 return NULL;
561 }
562 str[tlen] = '\0';
563 *len = tlen;
564 return (char *) str;
565 }
566}
567
568
569int is_hex(const u8 *data, size_t len)
570{
571 size_t i;
572
573 for (i = 0; i < len; i++) {
574 if (data[i] < 32 || data[i] >= 127)
575 return 1;
576 }
577 return 0;
578}
579
580
581int find_first_bit(u32 value)
582{
583 int pos = 0;
584
585 while (value) {
586 if (value & 0x1)
587 return pos;
588 value >>= 1;
589 pos++;
590 }
591
592 return -1;
593}
594
595
596size_t merge_byte_arrays(u8 *res, size_t res_len,
597 const u8 *src1, size_t src1_len,
598 const u8 *src2, size_t src2_len)
599{
600 size_t len = 0;
601
602 os_memset(res, 0, res_len);
603
604 if (src1) {
605 if (src1_len >= res_len) {
606 os_memcpy(res, src1, res_len);
607 return res_len;
608 }
609
610 os_memcpy(res, src1, src1_len);
611 len += src1_len;
612 }
613
614 if (src2) {
615 if (len + src2_len >= res_len) {
616 os_memcpy(res + len, src2, res_len - len);
617 return res_len;
618 }
619
620 os_memcpy(res + len, src2, src2_len);
621 len += src2_len;
622 }
623
624 return len;
625}
626
627
628char * dup_binstr(const void *src, size_t len)
629{
630 char *res;
631
632 if (src == NULL)
633 return NULL;
634 res = os_malloc(len + 1);
635 if (res == NULL)
636 return NULL;
637 os_memcpy(res, src, len);
638 res[len] = '\0';
639
640 return res;
641}
642
643
644int freq_range_list_parse(struct wpa_freq_range_list *res, const char *value)
645{
646 struct wpa_freq_range *freq = NULL, *n;
647 unsigned int count = 0;
648 const char *pos, *pos2, *pos3;
649
650 /*
651 * Comma separated list of frequency ranges.
652 * For example: 2412-2432,2462,5000-6000
653 */
654 pos = value;
655 while (pos && pos[0]) {
656 n = os_realloc_array(freq, count + 1,
657 sizeof(struct wpa_freq_range));
658 if (n == NULL) {
659 os_free(freq);
660 return -1;
661 }
662 freq = n;
663 freq[count].min = atoi(pos);
664 pos2 = os_strchr(pos, '-');
665 pos3 = os_strchr(pos, ',');
666 if (pos2 && (!pos3 || pos2 < pos3)) {
667 pos2++;
668 freq[count].max = atoi(pos2);
669 } else
670 freq[count].max = freq[count].min;
671 pos = pos3;
672 if (pos)
673 pos++;
674 count++;
675 }
676
677 os_free(res->range);
678 res->range = freq;
679 res->num = count;
680
681 return 0;
682}
683
684
685int freq_range_list_includes(const struct wpa_freq_range_list *list,
686 unsigned int freq)
687{
688 unsigned int i;
689
690 if (list == NULL)
691 return 0;
692
693 for (i = 0; i < list->num; i++) {
694 if (freq >= list->range[i].min && freq <= list->range[i].max)
695 return 1;
696 }
697
698 return 0;
699}
700
701
702char * freq_range_list_str(const struct wpa_freq_range_list *list)
703{
704 char *buf, *pos, *end;
705 size_t maxlen;
706 unsigned int i;
707 int res;
708
709 if (list->num == 0)
710 return NULL;
711
712 maxlen = list->num * 30;
713 buf = os_malloc(maxlen);
714 if (buf == NULL)
715 return NULL;
716 pos = buf;
717 end = buf + maxlen;
718
719 for (i = 0; i < list->num; i++) {
720 struct wpa_freq_range *range = &list->range[i];
721
722 if (range->min == range->max)
723 res = os_snprintf(pos, end - pos, "%s%u",
724 i == 0 ? "" : ",", range->min);
725 else
726 res = os_snprintf(pos, end - pos, "%s%u-%u",
727 i == 0 ? "" : ",",
728 range->min, range->max);
729 if (res < 0 || res > end - pos) {
730 os_free(buf);
731 return NULL;
732 }
733 pos += res;
734 }
735
736 return buf;
737}
738
739
740int int_array_len(const int *a)
741{
742 int i;
743 for (i = 0; a && a[i]; i++)
744 ;
745 return i;
746}
747
748
749void int_array_concat(int **res, const int *a)
750{
751 int reslen, alen, i;
752 int *n;
753
754 reslen = int_array_len(*res);
755 alen = int_array_len(a);
756
757 n = os_realloc_array(*res, reslen + alen + 1, sizeof(int));
758 if (n == NULL) {
759 os_free(*res);
760 *res = NULL;
761 return;
762 }
763 for (i = 0; i <= alen; i++)
764 n[reslen + i] = a[i];
765 *res = n;
766}
767
768
769static int freq_cmp(const void *a, const void *b)
770{
771 int _a = *(int *) a;
772 int _b = *(int *) b;
773
774 if (_a == 0)
775 return 1;
776 if (_b == 0)
777 return -1;
778 return _a - _b;
779}
780
781
782void int_array_sort_unique(int *a)
783{
784 int alen;
785 int i, j;
786
787 if (a == NULL)
788 return;
789
790 alen = int_array_len(a);
791 qsort(a, alen, sizeof(int), freq_cmp);
792
793 i = 0;
794 j = 1;
795 while (a[i] && a[j]) {
796 if (a[i] == a[j]) {
797 j++;
798 continue;
799 }
800 a[++i] = a[j++];
801 }
802 if (a[i])
803 i++;
804 a[i] = 0;
805}
806
807
808void int_array_add_unique(int **res, int a)
809{
810 int reslen;
811 int *n;
812
813 for (reslen = 0; *res && (*res)[reslen]; reslen++) {
814 if ((*res)[reslen] == a)
815 return; /* already in the list */
816 }
817
818 n = os_realloc_array(*res, reslen + 2, sizeof(int));
819 if (n == NULL) {
820 os_free(*res);
821 *res = NULL;
822 return;
823 }
824
825 n[reslen] = a;
826 n[reslen + 1] = 0;
827
828 *res = n;
829}